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Olioohjelmointiin, often translated as object-oriented programming (OOP), is a programming paradigm based on the concept of "objects". These objects can contain data, in the form of fields (often known as attributes or properties), and code, in the form of procedures (often known as methods). In OOP, objects are typically instances of classes, which are blueprints for creating objects. This approach aims to organize software design around data, rather than functions and logic.

The fundamental principles of object-oriented programming include encapsulation, inheritance, and polymorphism. Encapsulation is the bundling of data and methods that operate on the data within a single unit, the object, and restricting access to the data from outside. Inheritance allows new classes (child classes or subclasses) to inherit properties and behaviors from existing classes (parent classes or superclasses). Polymorphism, meaning "many forms," enables objects of different classes to respond to the same method call in their own specific ways.

Olioohjelmointiin gained prominence in the 1980s and is now one of the most widely used programming paradigms. Popular programming languages that support OOP include Java, Python, C++, C#, and Ruby. This paradigm facilitates code reusability, modularity, and easier maintenance of complex software systems by breaking them down into smaller, manageable, and interconnected components. It is widely applied in software development for a variety of applications, from web development to game design and operating systems.